Chelsea, MA Profile: Facts, Map & Data


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Chelsea, Massachusetts - Basic Facts

The City of Chelsea had a population of 38,702 as of July 1, 2017. Chelsea ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Massachusetts. See peer rankings below.

The primary coordinate point for Chelsea is located at latitude 42.3968 and longitude -71.0313 in Suffolk County. The formal boundaries for the City of Chelsea (see map below) encompass a land area of 2.21 sq. miles and a water area of 0.25 sq. miles. Suffolk County is in the Eastern time zone (GMT -5). The elevation is 39 feet.

The City of Chelsea (GNIS ID: 619464) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Beneath the boundary map are tables with Chelsea population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Chelsea: Romney Marsh, Rumney Marsh, Winisemit, Winne-ashim-ut, Winnet Semet, Winnisemit, Winnisimmet, Winnissimmet.

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City of Chelsea, MA Boundary Map

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Chelsea, MA Data & Demographics (As of July 1, 2017)


Total Population 38,702
Daytime Population: Workers 16,305
Daytime Population: Residents 19,312
Total Daytime Population (TDP) 35,617
Ratio TDP/Total Population1 0.92
Population in Households 37,977
Population in Familes 28,529
Population in Group Qrtrs 725
Population Density2 17,495
Diversity Index3 89


Median Household Income $40,297
Average Household Income $55,697
Per Capita Income $18,831


Total Housing Units 13,634 (100%)
Owner Occupied HU 3,428 (25.1%)
Renter Occupied HU 9,388 (68.9%)
Vacant Housing Units 818 ( 6.0%)
Median Home Value $309,033
Average Home Value $330,455


Total Households 12,816
Average Household Size 2.96
Family Households 7,977
Average Family Size 4
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 1.33% 1.19%
Households 1.11% 1.06%
Families 1.09% 1.05%
Median Household Income   1.13%
Per Capita Income   2.56%

Chelsea, MA - Peer Comparisons by Rank and Percentile

The table below compares Chelsea to the other 246 incorporated cities, towns and CDPs in Massachusetts by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 39 85th
Population Density # 3 99th
Diversity Index # 2 100th
Median Household Income # 235 5th
Per Capita Income # 242 2nd

Additional comparisons and rankings can be made with a VERY EASY TO USE Massachusetts Census Data Comparison Tool.

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